But the Australian Open champion believes he can get his hands on the Wimbledon trophy for a second time if he conquers the mental tussle with himself.

"I don't play mind games in the locker room with my competitors, with my rivals. I think that the biggest challenge, mental challenge, for myself is actually me," Djokovic said.

"I have a mental fight with myself where I try to focus on positive thoughts and then, if you manage to do that, because of intensity level and competition level, you go through a lot of stages where you have doubts. Where you have fears of winning, of losing, you know."

The French Open dream disappeared once again for another year as the title at Roland Garros continues to be missing from Djokovic's list of achievements, as a victory on the red dirt of Paris would see the Serb complete the Grand Slam.

Djokovic's only crowning at Wimbledon came during a historic year in 2011, where he won three of the four majors and seven other titles, including a record five Masters 1000 events.

And the top seed for SW19 added: "You're fighting that by yourself and then if you manage to focus your thoughts in the direction of positive then it radiates through you and your opponent feels it."